Walker Process Equipment

What Walker Process Equipment does

Walker Process Equipment is a US-based custom manufacturer of engineered wastewater and water treatment equipment, founded in 1946 and headquartered in Aurora, Illinois, where it operates a 100,000+ square foot office and manufacturing facility with in-house burning, AWS welding, machining, assembly, sandblasting, painting, and inspection capabilities. The company's product portfolio spans clarifiers (rectangular, bridge-supported, spiral rake, tapered suction header, UniMix, thickener), anaerobic digestion systems (fixed, floating, gasholder, and combination covers; heat exchangers; combination boilers; mixers), fixed film biological treatment (EnviroDisc Rotating Biological Contactors and Rotary Distributors), grit removal (HydroSeparator, Rolling Grit, GritWasher), grease and skimmings processing, and the InstoMix chemical flash mixer. Notable technical differentiators include in-house spur gear and worm gear drive manufacturing (AGMA member), ASME 'U' stamp certification for heat exchangers, and 25–30 year service-life track records on key products.

The company serves municipal water treatment facilities and industrial wastewater operators across the United States and Canada through a go-to-market model built around a nationwide network of 40+ independent sales representative companies, supported by in-house Regional Sales Managers, licensed professional engineers using structural and finite element analysis, and a dedicated Parts & Repairs service line backed by records of 10,000+ equipment installations. Revenue is generated primarily through custom-engineered equipment sales on a quote basis, OEM replacement parts, and field services for installation checkout, startup, and troubleshooting. Walker Process Equipment operates as a subsidiary of McNish Water and is privately held with no disclosed funding history or financial statements.

Name

Walker Process Equipment

Legal name

Walker Process Equipment

Website

https://walker-process.com

Company type

Private

Founded year

1946

Operating status

Operating

Short description

Walker Process Equipment is a 1946-founded US manufacturer of custom-engineered wastewater treatment equipment — clarifiers, anaerobic digesters, biological treatment systems, grit removal, and heat exchangers — serving municipal and industrial water treatment customers across North America through a nationwide independent sales rep network.

Ownership category

akta.pro rank

Product category

Wastewater Treatment Equipment Manufacturing

NAICS

Industrial Machinery Manufacturing (3332)

SIC

General Industrial Machinery & Equipment (3560)

akta.pro primary industry

Water & Wastewater Treatment Plant Equipment (Clarifiers, Aeration, Membrane Systems) (IMAHAEAJ)

Keywords

• Wastewater treatment equipment
• Clarifier manufacturing
• Anaerobic digestion systems
• Biological treatment equipment
• Grit removal systems

Headquarters

HQ city

Aurora

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Equipment Manufacturing & Sales: Custom engineered and manufactured wastewater treatment equipment including clarifiers, digesters, biological treatment systems, grit removal, and grease/skimmings processing equipment.
2. OEM Parts & Components: Parts department maintains records of over 10,000 equipment installations. Supplies repair parts for emergency and preventive maintenance needs including drive units, skimming equipment, spiral flights, rake arms, gas mixing equipment, digester covers, and RBC components.
3. Field Services: Field Service Technicians provide initial equipment installation checkout, startup services, and troubleshooting. Includes training and inspection services.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels3 records

Core offering

Walker Process Equipment designs, engineers, and manufactures custom wastewater treatment equipment for municipal and industrial customers, including clarifiers, anaerobic digestion systems, fixed film biological treatment equipment (Rotating Biological Contactors and Rotary Distributors), grit removal systems, and scum/grease processing equipment. All equipment is custom engineered to demanding specifications at the company's 100,000+ square foot Aurora, Illinois manufacturing facility, supported by OEM parts, field service, and project management.

Product overview

Walker Process Equipment is an industrial water and wastewater treatment equipment manufacturer founded in 1946, offering custom engineered products for clarifiers, anaerobic digestion, fixed film biological treatment, scum and grease processing, and grit removal. The product portfolio includes: Clarifiers (Rectangular Collectors, Bridge/Pier Supported mechanisms with Segmented Plow Flights, Spiral Rakes, Tapered Suction Headers, UniMix flocculation/clarification units, and Thickeners); Anaerobic Digestion Equipment (Fixed, Floating, Gasholder, and Combination Covers, Heat Exchangers, Mixers/Agitators, and Combination Boiler/Heat Exchanger packages); Biological Treatment (EnviroDisc Rotating Biological Contactors and Rotary Distributors for trickling filters); Chemical Processing (InstoMix Flash Mixer); Grease & Skimmings Removal (Pipe Skimmers, HeliSkim, Ramp Skimmers); and Grit Removal (GritWasher, HydroSeparator, Rolling Grit systems). The company operates a 100,000+ square foot manufacturing facility in Aurora, Illinois, holds ASME 'U' stamp certification, and maintains records for over 10,000 equipment installations. Services include OEM parts, field service, and project management.

Differentiator

Problem solved

Functional benefit

Products and services

• Rectangular Clarifiers Conventional chain and flight collectors for rectangular sedimentation basins using malleable iron or plastic chain, available in 4-shaft (sludge moving + surface skimming) or 3-shaft configurations, adjustable up to 30 feet wide and 250 feet long. Used by municipal and industrial wastewater treatment plants.
• Bridge-Supported Clarifiers with Segmented Plow Flights Bridge-supported clarifiers with collector arms featuring parallel straight steel flights fitted with adjustable squeegees to scrape settled sludge to a central hopper. Typically applied for primary clarifiers in municipal and industrial wastewater treatment plants.
• Spiral Rake Clarifiers Secondary clarifiers with spiral-shaped scraper blades at 30-degree angle of attack positioned to transport sludge to a central hopper or sludge manifold. Used in municipal and industrial wastewater treatment plants.
• Tapered Suction Header Clarifiers Secondary clarifier suction headers of rectangular cross-section, fully tapered from maximum at inner end to minimum at outer end to provide uniform sludge velocity in the header for rapid sludge removal. Used in municipal and industrial wastewater treatment plants.
• Sludge Thickeners Sludge thickeners available in bridge-supported or pier-supported configurations including pickets and dropped flights, featuring a central rotating drive cage with enclosed spur gear drive turntable unit. Used in municipal and industrial wastewater treatment plants.
• UniMix Flocculation/Clarification Units Clarifiers combining flocculation and clarification in a single tank with vertical shaft type flocculators in the influent well and variable speed mixers for adjustable mixing levels. Used in municipal and industrial water and wastewater treatment plants.
• Rotary Distributors Fixed film rotary distributors that distribute wastewater over trickling filter rock or media to ensure uniform filter loading. Available in Type M (up to 175 feet filter diameter, 5,000 GPM) and Type MT (up to 250 feet filter diameter, 25,000 GPM) configurations. Used in municipal and industrial biological wastewater treatment plants.
• EnviroDisc Rotating Biological Contactors (RBCs) Fixed film rotating biological contactors providing highly efficient BOD and ammonia removal with low energy usage. Features 30-inch diameter, 11'10" diameter shafts with 26'0" nominal length available in 100,000 and 150,000 square feet media area configurations. Used in municipal and industrial wastewater treatment plants.
• Anaerobic Digester Fixed Covers Fixed covers anchored to the top of digester tanks with static sludge level, offering the lowest cost option. Used often on primary digesters in two-stage anaerobic digestion systems.
• Anaerobic Digester Floating Covers Floating covers that float directly on sludge with variable sludge levels, featuring both ceiling and roof plates forming an attic space. Provides scum suppression and good insulation for anaerobic digestion systems.
• Anaerobic Digester Gasholder Covers Gas holder covers that ride on a constant pressure, variable volume gas bubble for gas storage. Typically applied on second stage anaerobic digesters with 5' to 7' deep rim plate for gas storage.
• Anaerobic Digester Combination Covers Digestion cover combining features of floating cover and gasholder with longer skirt, columns, and ballast in skirt bottom. Offers better insulation than gasholder with trusses protected from corrosive interior.
• Anaerobic Digester Heat Exchangers Concentric tube counterflow heat exchangers for digester heating. Available in water-to-sludge and sludge-to-sludge configurations, with the latter designed for temperature phased anaerobic digestion systems. Manufactured under ASME U-stamp certification.
• Anaerobic Digester Mixers (Agitators) Cover-mounted vertical shaft mixers providing low energy, maintenance-free mixing for anaerobic digesters. Features stainless steel impellers, labyrinth water seal, and automatic reversal of shaft rotation. STAMO-supplied components integrated into the offering.
• Combination Boiler & Heat Exchanger Systems Packaged boiler and heat exchanger systems with operating temperature range of 180 to 190°F. Features Scotch Marine boiler with refractory lined back plate and concentric tube heat exchangers with countercurrent forced circulation. Designed for anaerobic digester heating.
• Industrial Boilers Industrial boilers in 7 sizes ranging from 270,000 to 2,000,000 BTU/hr for use in combination boiler/heat exchanger packages. Fuels include digester gas with auxiliary natural gas, propane, or fuel oil. Used in anaerobic digester heating applications.
• InstoMix Chemical Flash Mixer In-line mixers providing continuous, instantaneous blending of coagulant in raw water prior to flocculation. Compact flange-mounted units for 8-inch through 72-inch diameter pipelines with internal chemical feed manifold. Used in water treatment plants for chemical dosing prior to flocculation.
• Grease & Skimmings Removal Systems Systems for removing floating grease and scum including Pipe Skimmers (steel pipe with 60-degree slot), HeliSkim motor-driven helical blade skimmers, and Ramp Skimmers for large quantities. Used in municipal and industrial wastewater treatment plants.
• GritWasher Systems Dewatering and cleaning equipment for grit after removal from plant flow. Four sizes available: GW100 (up to 50 GPM), GW150 (up to 110 GPM), GW200 (up to 250 GPM), GW350 (up to 400 GPM). Available in stainless steel. Used in municipal and industrial wastewater treatment plants.
• HydroSeparator Grit Removal Systems Grit collection, removal, and dewatering system for 1.0 to 25.0 MGD peak flow. Tank sizes from 8'x8'x3' to 40'x40'x5' AWD with heavy-duty circular collector and low horsepower requirements. Used in municipal and industrial wastewater treatment plants.
• Rolling Grit Systems Total system for grit removal and dewatering with pre-aeration. Single units to 21 MGD peak flows with tank sizes from 8'x8'x10' to 30'x30'x14' AWD. Features no moving parts in grit basin reducing maintenance. Used in municipal and industrial wastewater treatment plants.
• OEM Parts & Repair Services OEM parts, field service, and repair support for existing Walker Process equipment backed by detailed equipment records for over 10,000 installations. Includes emergency and preventive maintenance parts support covering drive units, skimming equipment, spiral flights, rake arms, gas mixing equipment, digester covers, and RBC components.

Quantifiable outcome

• 25-30 years of full efficiency operation for HeatX heat exchanger units
• +2 more outcomes

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Partnerships

28 partnerships are on record, tiered core.

• Principle Environmental, Inc.coreChannel Partner/ Reseller/ DistributorSales representative covering Alabama, Georgia, and Panhandle Florida areas. Located in Atlanta, GA. Provides equipment selection and project support for municipal and industrial applications in assigned territories.
• Treatment Equipment Co.coreChannel Partner/ Reseller/ DistributorSales representative covering Alaska and Northern Idaho regions. Located in North Bend, WA. Supports equipment selection and sales for assigned territories.
• IES Southwest, Inc.coreChannel Partner/ Reseller/ DistributorSales representative for Arizona territory. Located in Cave Creek, Arizona. Provides application expertise for water treatment equipment sales.
• Instrument & Supply, Inc.coreChannel Partner/ Reseller/ DistributorSales representative covering Arkansas and Louisiana (Industrial). Located in Hot Springs, Arkansas. Provides equipment and supply support for municipal and industrial applications.
• MuniQuip LLCcoreChannel Partner/ Reseller/ DistributorSales representative for Northern California counties and Northern Nevada. Located in Roseville, CA. Provides equipment selection and support for municipal water treatment applications.
• Flo-Systems, Inc.coreChannel Partner/ Reseller/ DistributorSales representative for Southern California counties and Southern Nevada. Located in Anaheim Hills, CA. Supports equipment sales and application engineering.
• Cogent, Inc.coreChannel Partner/ Reseller/ DistributorSales representative covering Colorado, Southern Idaho, and Montana regions. Multiple contacts including Frank Henderson (Colorado) and Jeremy Jensen (Idaho). Supports equipment selection across assigned territories.
• Koester AssociatescoreChannel Partner/ Reseller/ DistributorSales representative covering Connecticut (Fairfield County), New Jersey (Northern), New York City area, and Greater New York State. Located in Kinnelon, NJ and Canastota, NY. Major regional representative with multiple territory coverage.
• F.R. Mahony & AssociatescoreChannel Partner/ Reseller/ DistributorSales representative covering Connecticut (all counties except Fairfield), Maine, and Massachusetts. Located in Rockland, MA. Provides application support and equipment selection for New England territories.
• Riordan Materials CorporationcoreChannel Partner/ Reseller/ DistributorSales representative covering Delaware, Maryland, Southern New Jersey, and Eastern/Central Pennsylvania. Multiple contacts including offices in Crofton, MD and Blue Bell, PA. Supports equipment sales across mid-Atlantic regions.
• MTS Environmental, Inc.coreChannel Partner/ Reseller/ DistributorSales representative covering Florida with offices in Ponte Vedra Beach, Wesley Chapel, and West Palm Beach. Multiple contacts for comprehensive Florida coverage.
• CBC, Inc.coreChannel Partner/ Reseller/ DistributorSales representative for Hawaii territory. Located in Kaneohe, Hawaii. Provides equipment support for the Hawaiian market.
• Vandevanter EngineeringcoreChannel Partner/ Reseller/ DistributorSales representative covering Southern Illinois (Municipal/Industrial), Far Western Kentucky, and Eastern Missouri. Multiple offices including Decatur, IL and Calvert City, KY. Provides comprehensive sales and application support.
• LAI, Ltd.coreChannel Partner/ Reseller/ DistributorSales representative covering Northern Illinois (Municipal), Indiana (Lake and Porter Counties Municipal), Eastern Wisconsin, and multiple other territories. Located in Rolling Meadows, IL and Madison, WI. Major regional representative with specialized municipal focus.
• Drydon Equipment Inc.coreChannel Partner/ Reseller/ DistributorSales representative covering Northern Illinois (Industrial), Indiana (Industrial), and Industrial Wisconsin. Multiple contacts including offices in Bourbonnais, IL and New Berlin, IL. Specializes in industrial applications.
• J. Dwight Thompson Co.coreChannel Partner/ Reseller/ DistributorSales representative covering Indiana (Municipal/Industrial), Southern Ohio, and Kentucky. Multiple offices including Miamitown, OH and Mason, OH. Provides equipment selection and project support for assigned territories.
• Bert Gurney & AssociatescoreChannel Partner/ Reseller/ DistributorSales representative for Iowa and Nebraska territories. Located in Omaha, NE. Supports equipment sales and application engineering.
• Fluid Equipment Co., Inc.coreChannel Partner/ Reseller/ DistributorSales representative covering Kansas and Western Missouri. Offices in Lee's Summit, MO and Andover, KS. Provides equipment support for Midwestern territories.
• Coastal Process, LLCcoreChannel Partner/ Reseller/ DistributorSales representative for Louisiana (Municipal). Located in Holden, LA. Provides municipal water treatment equipment support for Louisiana.
• DuBois-Cooper AssociatescoreChannel Partner/ Reseller/ DistributorSales representative for Michigan territory. Located in Plymouth, MI. Supports equipment selection and sales for Michigan market.
• Northwestern Power Equipment CompanycoreChannel Partner/ Reseller/ DistributorSales representative covering Minnesota, North Dakota, and Western Wisconsin. Multiple contacts including offices in Roseville, MN and Fargo, SD. Provides comprehensive coverage for Upper Midwest territories.
• Dongo Water & Wastewater Equipment Sales, LLCcoreChannel Partner/ Reseller/ DistributorSales representative covering Connecticut (RBCs only), New York City area (RBCs only), and Greater New York State. Specializes in Rotating Biological Contactors. Located in Red Hook, NY.
• Combs & Associates, Inc.coreChannel Partner/ Reseller/ DistributorSales representative covering North Carolina, South Carolina, and Virginia. Multiple contacts including offices in Charlotte, NC and Columbia, SC. Provides comprehensive Southeast coverage.
• BissNuss Inc. dba The Bergren AssociatescoreChannel Partner/ Reseller/ DistributorSales representative covering Northern Ohio and Western Pennsylvania. Website: www.bissnussinc.com. Provides equipment support for Ohio and Western PA territories.
• Hartwell Environmental CorporationcoreChannel Partner/ Reseller/ DistributorSales representative covering Oklahoma and multiple Texas locations (Tomball, Austin, Arlington). Multiple offices providing comprehensive Texas and Oklahoma coverage.
• Novatech Equipment Sales (ALTA), Inc.coreChannel Partner/ Reseller/ DistributorSales representative covering Alberta and Northwest Territories (East of 120° Longitude). Located in Sherwood Park (Edm.), Alberta, Canada. Supports Canadian market expansion.
• Novatech Equipment Sales (B.C.), Inc.coreChannel Partner/ Reseller/ DistributorSales representative covering British Columbia and Northwest Territories (West of 120° Longitude). Located in North Vancouver, BC, Canada. Website: www.novatechequipmentsales.com.
• ACG EnvirocancoreChannel Partner/ Reseller/ DistributorSales representative covering Ontario territory. Located in Woodbridge, ON, Canada. Website: www.acgtechnology.com. Provides equipment support for Ontario market.

Scale indicators4 records

Recent moves5 records

Expansion highlights4 records

Direct peers

• Parkson Corporation: North American provider of municipal and industrial water and wastewater treatment equipment, including clarification, biological treatment, and filtration. Direct competitor in the same product categories serving the same municipal and industrial segments.
• Smith & Loveless: Long-established US manufacturer of custom-engineered municipal wastewater treatment equipment, including clarifiers, grit removal, and packaged treatment plants. Closely comparable to Walker Process in product scope, custom-engineering model, and municipal/industrial customer base.
• Schreiber LLC: Supplier of wastewater treatment systems including trickling filters, rotating biological contactors (RBCs), and clarification equipment — directly overlapping Walker Process's EnviroDisc RBC and biological treatment product lines for municipal customers.
• WesTech Engineering: Designer and manufacturer of water and wastewater treatment equipment for municipal and industrial customers, with overlapping clarifier, filtration, and biological treatment product lines. Highly comparable custom-engineering, project-based business model.
• Aqua-Aerobic Systems: US manufacturer of aeration, clarification, filtration, and biological treatment equipment for municipal wastewater and clean-water applications. Competes head-to-head with Walker Process in clarifiers and biological treatment systems.
• Envirodyne Systems: Manufacturer of custom water and wastewater treatment equipment for municipal and industrial clients, including clarification, biological treatment, and sludge processing. Comparable mid-sized US custom OEM competing in the same specification-driven bid environment.

Emerging players

• S&N Airoflo: Niche manufacturer of aeration and biological treatment equipment for wastewater plants. Smaller and more focused than Walker Process but addresses overlapping fixed-film and biological treatment applications for municipal customers.

Broad incumbents

• Veolia Water Technologies & Solutions: Global provider of water and wastewater treatment solutions, including engineered equipment, chemicals, and digital services. Overlaps with Walker Process in clarifier, biological, and sludge treatment equipment but operates at significantly larger scale and geographic reach.
• Evoqua Water Technologies: Large, publicly-traded (now part of Xylem) provider of water and wastewater treatment products, services, and systems across municipal and industrial markets. Overlaps with Walker Process in treatment equipment but offers a much broader portfolio including services and digital offerings.
• Xylem (Flygt, Wedeco, Sanitaire): Global water technology company with major presence in pumps, aeration, disinfection, and treatment equipment for municipal and industrial water/wastewater. Competes with Walker Process on aeration, biological treatment, and large turnkey municipal projects.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/walker-process-equipment-div-of-mcnish-corp

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Walker Process Equipment